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Handle different or non inputs, unit tests, error messages
Deletion of enums from the database
Re #7551 Connection between database and frontend
Re #7551 Typing errors in init script
Re #7551 Remove taken vacations from api and db
Re #7551 Admin user
Re #7526 Database queries
Re #7385 Initialisation of the database
Re #7386 Implemented APIs endpoints with DTOs